package loxia.utils;

import java.util.Calendar;

public class ChineseCalendarGB {

	private int gregorianYear;
	   private int gregorianMonth;
	   private int gregorianDate;
	   private boolean isGregorianLeap;
	   private int dayOfYear;
	   private int dayOfWeek; // 周日一星期的第一天
	   private int chineseYear;
	   private int chineseMonth; // 负数表示闰月
	   private int chineseDate;
	   private int sectionalTerm;
	   private int principleTerm;
	   private static char[] daysInGregorianMonth = 
	      {31,28,31,30,31,30,31,31,30,31,30,31};
	   private static String[] stemNames =
	      {"甲","乙","丙","丁","戊","己","庚","辛","壬","癸"};
	   private static String[] branchNames =
	      {"子","丑","寅","卯","辰","巳","午","未","申","酉","戌","亥"};
	   private static String[] animalNames =
	      {"鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪"};
	   
	   public static void main(String[] arg) {
	      ChineseCalendarGB c = new ChineseCalendarGB();
	      String cmd = "day";
	      int y = 1901;
	      int m = 1;
	      int d = 1;
	      if (arg.length>0) cmd = arg[0];
	      if (arg.length>1) y = Integer.parseInt(arg[1]);
	      if (arg.length>2) m = Integer.parseInt(arg[2]);
	      if (arg.length>3) d = Integer.parseInt(arg[3]);
	      c.setGregorian(y,m,d);
	      c.computeChineseFields();
	      c.computeSolarTerms();
	      if (cmd.equalsIgnoreCase("year")) {
	         String[] t = c.getYearTable();
	         for (int i=0; i<t.length; i++) System.out.println(t[i]);
	      } else if (cmd.equalsIgnoreCase("month")) {
	         String[] t = c.getMonthTable();
	         for (int i=0; i<t.length; i++) System.out.println(t[i]);
	      } else {
	         System.out.println(c.toString());
	      }
	   }
	   
	   public ChineseCalendarGB() {
	      setGregorian(1901,1,1);
	   }
	   public void setGregorian(int y, int m, int d) {
	      gregorianYear = y;
	      gregorianMonth = m;
	      gregorianDate = d;
	      isGregorianLeap = isGregorianLeapYear(y);
	      dayOfYear = dayOfYear(y,m,d);
	      dayOfWeek = dayOfWeek(y,m,d);
	      chineseYear = 0;
	      chineseMonth = 0;
	      chineseDate = 0;
	      sectionalTerm = 0;
	      principleTerm = 0;
	   }
	   public static boolean isGregorianLeapYear(int year) {
	      boolean isLeap = false;
	      if (year%4==0) isLeap = true;
	      if (year%100==0) isLeap = false;
	      if (year%400==0) isLeap = true;
	      return isLeap;
	   }
	   public static int daysInGregorianMonth(int y, int m) {
	      int d = daysInGregorianMonth[m-1];
	      if (m==2 && isGregorianLeapYear(y)) d++; // 公历闰年二月多一天
	      return d;
	   }
	   
	   public static int dayOfYear(int y, int m, int d) {
	      int c = 0;
	      for (int i=1; i<m; i++) {
	         c = c + daysInGregorianMonth(y,i);
	      }
	      c = c + d;
	      return c;      
	   }
	   
	   public static int dayOfWeek(int y, int m, int d) {
	      int w = 1; // 公历一年一月一日是星期一，所以起始值为星期日
	      y = (y-1)%400 + 1; // 公历星期值分部 400 年循环一次
	      int ly = (y-1)/4; // 闰年次数
	      ly = ly - (y-1)/100;
	      ly = ly + (y-1)/400;
	      int ry = y - 1 - ly; // 常年次数
	      w = w + ry; // 常年星期值增一
	      w = w + 2*ly; // 闰年星期值增二
	      w = w + dayOfYear(y,m,d); 
	      w = (w-1)%7 + 1;
	      return w;
	   }
	   
	   private static char[] chineseMonths = { 
	   // 农历月份大小压缩表，两个字节表示一年。两个字节共十六个二进制位数， 
	   // 前四个位数表示闰月月份，后十二个位数表示十二个农历月份的大小。
	   0x00,0x04,0xad,0x08,0x5a,0x01,0xd5,0x54,0xb4,0x09,0x64,0x05,0x59,0x45,
	   0x95,0x0a,0xa6,0x04,0x55,0x24,0xad,0x08,0x5a,0x62,0xda,0x04,0xb4,0x05,
	   0xb4,0x55,0x52,0x0d,0x94,0x0a,0x4a,0x2a,0x56,0x02,0x6d,0x71,0x6d,0x01,
	   0xda,0x02,0xd2,0x52,0xa9,0x05,0x49,0x0d,0x2a,0x45,0x2b,0x09,0x56,0x01,
	   0xb5,0x20,0x6d,0x01,0x59,0x69,0xd4,0x0a,0xa8,0x05,0xa9,0x56,0xa5,0x04,
	   0x2b,0x09,0x9e,0x38,0xb6,0x08,0xec,0x74,0x6c,0x05,0xd4,0x0a,0xe4,0x6a,
	   0x52,0x05,0x95,0x0a,0x5a,0x42,0x5b,0x04,0xb6,0x04,0xb4,0x22,0x6a,0x05,
	   0x52,0x75,0xc9,0x0a,0x52,0x05,0x35,0x55,0x4d,0x0a,0x5a,0x02,0x5d,0x31,
	   0xb5,0x02,0x6a,0x8a,0x68,0x05,0xa9,0x0a,0x8a,0x6a,0x2a,0x05,0x2d,0x09,
	   0xaa,0x48,0x5a,0x01,0xb5,0x09,0xb0,0x39,0x64,0x05,0x25,0x75,0x95,0x0a,
	   0x96,0x04,0x4d,0x54,0xad,0x04,0xda,0x04,0xd4,0x44,0xb4,0x05,0x54,0x85,
	   0x52,0x0d,0x92,0x0a,0x56,0x6a,0x56,0x02,0x6d,0x02,0x6a,0x41,0xda,0x02,
	   0xb2,0xa1,0xa9,0x05,0x49,0x0d,0x0a,0x6d,0x2a,0x09,0x56,0x01,0xad,0x50,
	   0x6d,0x01,0xd9,0x02,0xd1,0x3a,0xa8,0x05,0x29,0x85,0xa5,0x0c,0x2a,0x09,
	   0x96,0x54,0xb6,0x08,0x6c,0x09,0x64,0x45,0xd4,0x0a,0xa4,0x05,0x51,0x25,
	   0x95,0x0a,0x2a,0x72,0x5b,0x04,0xb6,0x04,0xac,0x52,0x6a,0x05,0xd2,0x0a,
	   0xa2,0x4a,0x4a,0x05,0x55,0x94,0x2d,0x0a,0x5a,0x02,0x75,0x61,0xb5,0x02,
	   0x6a,0x03,0x61,0x45,0xa9,0x0a,0x4a,0x05,0x25,0x25,0x2d,0x09,0x9a,0x68,
	   0xda,0x08,0xb4,0x09,0xa8,0x59,0x54,0x03,0xa5,0x0a,0x91,0x3a,0x96,0x04,
	   0xad,0xb0,0xad,0x04,0xda,0x04,0xf4,0x62,0xb4,0x05,0x54,0x0b,0x44,0x5d,
	   0x52,0x0a,0x95,0x04,0x55,0x22,0x6d,0x02,0x5a,0x71,0xda,0x02,0xaa,0x05,
	   0xb2,0x55,0x49,0x0b,0x4a,0x0a,0x2d,0x39,0x36,0x01,0x6d,0x80,0x6d,0x01,
	   0xd9,0x02,0xe9,0x6a,0xa8,0x05,0x29,0x0b,0x9a,0x4c,0xaa,0x08,0xb6,0x08,
	   0xb4,0x38,0x6c,0x09,0x54,0x75,0xd4,0x0a,0xa4,0x05,0x45,0x55,0x95,0x0a,
	   0x9a,0x04,0x55,0x44,0xb5,0x04,0x6a,0x82,0x6a,0x05,0xd2,0x0a,0x92,0x6a,
	   0x4a,0x05,0x55,0x0a,0x2a,0x4a,0x5a,0x02,0xb5,0x02,0xb2,0x31,0x69,0x03,
	   0x31,0x73,0xa9,0x0a,0x4a,0x05,0x2d,0x55,0x2d,0x09,0x5a,0x01,0xd5,0x48,
	   0xb4,0x09,0x68,0x89,0x54,0x0b,0xa4,0x0a,0xa5,0x6a,0x95,0x04,0xad,0x08,
	   0x6a,0x44,0xda,0x04,0x74,0x05,0xb0,0x25,0x54,0x03
	   };
	   // 初始日，公历农历对应日期：
	   // 公历 1901 年 1 月 1 日，对应农历 4598 年 11 月 11 日
	   private static int baseYear = 1901;
	   private static int baseMonth = 1;
	   private static int baseDate = 1;
	   private static int baseIndex = 0;
	   private static int baseChineseYear = 4598-1;
	   private static int baseChineseMonth = 11;
	   private static int baseChineseDate = 11;
	   public int computeChineseFields() {
	      if (gregorianYear<1901 || gregorianYear>2100) return 1;
	      int startYear = baseYear;
	      int startMonth = baseMonth;
	      int startDate = baseDate;      
	      chineseYear = baseChineseYear; 
	      chineseMonth = baseChineseMonth;
	      chineseDate = baseChineseDate;
	      // 第二个对应日，用以提高计算效率
	      // 公历 2000 年 1 月 1 日，对应农历 4697 年 11 月 25 日
	      if (gregorianYear >= 2000) {
	         startYear = baseYear + 99;
	         startMonth = 1;
	         startDate = 1;
	         chineseYear = baseChineseYear + 99;
	         chineseMonth = 11;
	         chineseDate = 25;
	      }
	      int daysDiff = 0;
	      for (int i=startYear; i<gregorianYear; i++) {
	         daysDiff += 365;
	         if (isGregorianLeapYear(i)) daysDiff += 1; // leap year
	      }
	      for (int i=startMonth; i<gregorianMonth; i++) {
	         daysDiff += daysInGregorianMonth(gregorianYear,i);
	      }
	      daysDiff += gregorianDate - startDate;
	      
	      chineseDate += daysDiff;
	      int lastDate = daysInChineseMonth(chineseYear, chineseMonth);
	      int nextMonth = nextChineseMonth(chineseYear, chineseMonth);
	      while (chineseDate>lastDate) {
	         if (Math.abs(nextMonth)<Math.abs(chineseMonth)) chineseYear++;
	         chineseMonth = nextMonth;
	         chineseDate -= lastDate;
	         lastDate = daysInChineseMonth(chineseYear, chineseMonth);
	         nextMonth = nextChineseMonth(chineseYear, chineseMonth);
	      }
	      return 0;
	   }
	   private static int[] bigLeapMonthYears = {
	      // 大闰月的闰年年份
	        6, 14, 19, 25, 33, 36, 38, 41, 44, 52, 
	       55, 79,117,136,147,150,155,158,185,193
	      };
	   public static int daysInChineseMonth(int y, int m) {
	      // 注意：闰月 m < 0
	      int index = y - baseChineseYear + baseIndex;
	      int v = 0;
	      int l = 0;
	      int d = 30;
	      if (1<=m && m<=8) {
	         v = chineseMonths[2*index];
	         l = m - 1;
	         if ( ((v>>l)&0x01)==1 ) d = 29;
	      } else if (9<=m && m<=12) {
	         v = chineseMonths[2*index+1];
	         l = m - 9;
	         if ( ((v>>l)&0x01)==1 ) d = 29;
	      } else {
	         v = chineseMonths[2*index+1];
	         v = (v>>4)&0x0F;
	         if (v!=Math.abs(m)) {
	            d = 0;
	         } else {
	            d = 29; 
	            for (int i=0; i<bigLeapMonthYears.length; i++) {
	               if (bigLeapMonthYears[i]==index) {
	                  d = 30;
	                  break;
	               }
	            }
	         }
	      }
	      return d;
	   }
	   public static int nextChineseMonth(int y, int m) {
	      int n = Math.abs(m) + 1;
	      if (m>0) {
	         int index = y - baseChineseYear + baseIndex;
	         int v = chineseMonths[2*index+1];
	         v = (v>>4)&0x0F;
	         if (v==m) n = -m;
	      }
	      if (n==13) n = 1;
	      return n;
	   }
	   private static char[][] sectionalTermMap = {
	   {7,6,6,6,6,6,6,6,6,5,6,6,6,5,5,6,6,5,5,5,5,5,5,5,5,4,5,5},  
	   {5,4,5,5,5,4,4,5,5,4,4,4,4,4,4,4,4,3,4,4,4,3,3,4,4,3,3,3},  
	   {6,6,6,7,6,6,6,6,5,6,6,6,5,5,6,6,5,5,5,6,5,5,5,5,4,5,5,5,5},
	   {5,5,6,6,5,5,5,6,5,5,5,5,4,5,5,5,4,4,5,5,4,4,4,5,4,4,4,4,5},
	   {6,6,6,7,6,6,6,6,5,6,6,6,5,5,6,6,5,5,5,6,5,5,5,5,4,5,5,5,5},
	   {6,6,7,7,6,6,6,7,6,6,6,6,5,6,6,6,5,5,6,6,5,5,5,6,5,5,5,5,4,5,5,5,5},
	   {7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,6,6,7,7,6,6,6,7,7},
	   {8,8,8,9,8,8,8,8,7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,6,6,7,7,7},
	   {8,8,8,9,8,8,8,8,7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,7},
	   {9,9,9,9,8,9,9,9,8,8,9,9,8,8,8,9,8,8,8,8,7,8,8,8,7,7,8,8,8},
	   {8,8,8,8,7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,6,6,7,7,7},
	   {7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,6,6,7,7,6,6,6,7,7} 
	   }; 
	   private static char[][] sectionalTermYear = {
	   {13,49,85,117,149,185,201,250,250},
	   {13,45,81,117,149,185,201,250,250},
	   {13,48,84,112,148,184,200,201,250},
	   {13,45,76,108,140,172,200,201,250},
	   {13,44,72,104,132,168,200,201,250},
	   {5 ,33,68,96 ,124,152,188,200,201},
	   {29,57,85,120,148,176,200,201,250},
	   {13,48,76,104,132,168,196,200,201},
	   {25,60,88,120,148,184,200,201,250},
	   {16,44,76,108,144,172,200,201,250},
	   {28,60,92,124,160,192,200,201,250},
	   {17,53,85,124,156,188,200,201,250} 
	   };
	   private static char[][] principleTermMap = {
	   {21,21,21,21,21,20,21,21,21,20,20,21,21,20,20,20,20,20,20,20,20,19,
	      20,20,20,19,19,20},
	   {20,19,19,20,20,19,19,19,19,19,19,19,19,18,19,19,19,18,18,19,19,18,
	      18,18,18,18,18,18},
	   {21,21,21,22,21,21,21,21,20,21,21,21,20,20,21,21,20,20,20,21,20,20,
	      20,20,19,20,20,20,20},
	   {20,21,21,21,20,20,21,21,20,20,20,21,20,20,20,20,19,20,20,20,19,19,
	      20,20,19,19,19,20,20},
	   {21,22,22,22,21,21,22,22,21,21,21,22,21,21,21,21,20,21,21,21,20,20,
	      21,21,20,20,20,21,21},
	   {22,22,22,22,21,22,22,22,21,21,22,22,21,21,21,22,21,21,21,21,20,21,
	      21,21,20,20,21,21,21},
	   {23,23,24,24,23,23,23,24,23,23,23,23,22,23,23,23,22,22,23,23,22,22,
	      22,23,22,22,22,22,23},
	   {23,24,24,24,23,23,24,24,23,23,23,24,23,23,23,23,22,23,23,23,22,22,
	      23,23,22,22,22,23,23},
	   {23,24,24,24,23,23,24,24,23,23,23,24,23,23,23,23,22,23,23,23,22,22,
	      23,23,22,22,22,23,23},
	   {24,24,24,24,23,24,24,24,23,23,24,24,23,23,23,24,23,23,23,23,22,23,
	      23,23,22,22,23,23,23},
	   {23,23,23,23,22,23,23,23,22,22,23,23,22,22,22,23,22,22,22,22,21,22,
	      22,22,21,21,22,22,22},
	   {22,22,23,23,22,22,22,23,22,22,22,22,21,22,22,22,21,21,22,22,21,21,
	      21,22,21,21,21,21,22}
	   };
	   private static char[][] principleTermYear = {
	   {13,45,81,113,149,185,201},    
	   {21,57,93,125,161,193,201},    
	   {21,56,88,120,152,188,200,201},
	   {21,49,81,116,144,176,200,201},
	   {17,49,77,112,140,168,200,201},
	   {28,60,88,116,148,180,200,201},
	   {25,53,84,112,144,172,200,201},
	   {29,57,89,120,148,180,200,201},
	   {17,45,73,108,140,168,200,201},
	   {28,60,92,124,160,192,200,201},
	   {16,44,80,112,148,180,200,201},
	   {17,53,88,120,156,188,200,201} 
	   };
	   public int computeSolarTerms() {
	      if (gregorianYear<1901 || gregorianYear>2100) return 1;
	      sectionalTerm = sectionalTerm(gregorianYear, gregorianMonth);
	      principleTerm = principleTerm(gregorianYear, gregorianMonth);
	      return 0;
	   }
	   public static int sectionalTerm(int y, int m) {
	      if (y<1901 || y>2100) return 0;
	      int index = 0;
	      int ry = y-baseYear+1;
	      while (ry>=sectionalTermYear[m-1][index]) index++;
	      int term = sectionalTermMap[m-1][4*index+ry%4];
	      if ((ry == 121)&&(m == 4)) term = 5;
	      if ((ry == 132)&&(m == 4)) term = 5;
	      if ((ry == 194)&&(m == 6)) term = 6;
	      return term;
	   }
	   public static int principleTerm(int y, int m) {
	      if (y<1901 || y>2100) return 0;
	      int index = 0;
	      int ry = y-baseYear+1;
	      while (ry>=principleTermYear[m-1][index]) index++;
	      int term = principleTermMap[m-1][4*index+ry%4];
	      if ((ry == 171)&&(m == 3)) term = 21;
	      if ((ry == 181)&&(m == 5)) term = 21;
	      return term;
	   }
	   public String toString() {
	      StringBuffer buf = new StringBuffer();
	      buf.append("Gregorian Year: "+gregorianYear+"\n");
	      buf.append("Gregorian Month: "+gregorianMonth+"\n");
	      buf.append("Gregorian Date: "+gregorianDate+"\n");
	      buf.append("Is Leap Year: "+isGregorianLeap+"\n");
	      buf.append("Day of Year: "+dayOfYear+"\n");
	      buf.append("Day of Week: "+dayOfWeek+"\n");
	      buf.append("Chinese Year: "+chineseYear+"\n");
	      buf.append("Heavenly Stem: "+((chineseYear-1)%10)+"\n");
	      buf.append("Earthly Branch: "+((chineseYear-1)%12)+"\n");
	      buf.append("Chinese Month: "+chineseMonth+"\n");
	      buf.append("Chinese Date: "+chineseDate+"\n");
	      buf.append("Sectional Term: "+sectionalTerm+"\n");
	      buf.append("Principle Term: "+principleTerm+"\n");
	      return buf.toString();
	   }
	   public String[] getYearTable() {
	      setGregorian(gregorianYear,1,1);
	      computeChineseFields();
	      computeSolarTerms();
	      String[] table = new String[58]; // 6*9 + 4
	      table[0] = getTextLine(27, "公历年历："+gregorianYear);
	      table[1] = getTextLine(27, "农历年历："+(chineseYear+1)
	         + " ("+stemNames[(chineseYear+1-1)%10]
	         + branchNames[(chineseYear+1-1)%12]
	         + " - "+animalNames[(chineseYear+1-1)%12]+"年)");
	      int ln = 2;
	      String blank  = "                                         "
	              +"  " + "                                         ";
	      String[] mLeft = null;
	      String[] mRight = null;
	      for (int i=1; i<=6; i++) {
	         table[ln] = blank;
	         ln++;
	         mLeft = getMonthTable();
	         mRight = getMonthTable();
	         for (int j=0; j<mLeft.length; j++) {
	            String line = mLeft[j] + "  " + mRight[j];
	            table[ln] = line;
	            ln++;
	         }
	      }
	      table[ln] = blank;
	      ln++;
	      table[ln] = getTextLine(0,
	         "##/## - 公历日期/农历日期，(*)#月 - (闰)农历月第一天");
	      ln++;
	      return table;
	   }
	   public static String getTextLine(int s, String t) {
	      String str  = "                                         "
	              +"  " + "                                         ";
	      if (t!=null && s<str.length() && s+t.length()<str.length())
	         str = str.substring(0,s) + t + str.substring(s+t.length());
	      return str;
	   }
	   private static String[] monthNames =
	      {"一","二","三","四","五","六","七","八","九","十","十一","十二"};
	   public String[] getMonthTable() {
	      setGregorian(gregorianYear,gregorianMonth,1);
	      computeChineseFields();
	      computeSolarTerms();
	      String[] table = new String[8]; 
	      String title  = null;
	      if (gregorianMonth<11) title  = "                   ";
	      else title  = "                 ";
	      title = title + monthNames[gregorianMonth-1] + "月"
	                    + "                   ";
	      String header = "   日    一    二    三    四    五    六 ";
	      String blank  = "                                          ";
	      table[0] = title;
	      table[1] = header;
	      int wk = 2;
	      String line = "";
	      for (int i=1; i<dayOfWeek; i++) {
	         line += "     " + ' ';
	      }
	      int days = daysInGregorianMonth(gregorianYear,gregorianMonth);
	      for (int i=gregorianDate; i<=days; i++) {
	         line += getDateString() + ' ';
	         rollUpOneDay();
	         if (dayOfWeek==1) {
	            table[wk] = line;
	            line = "";
	            wk++;
	         }
	      }
	      for (int i=dayOfWeek; i<=7; i++) {
	         line += "     " + ' ';
	      }
	      table[wk] = line;
	      for (int i=wk+1; i<table.length; i++) {
	         table[i] = blank;
	      }
	      for (int i=0; i<table.length; i++) {
	         table[i] = table[i].substring(0,table[i].length()-1);
	      }
	      
	      return table;
	   }
	   private static String[] chineseMonthNames =
	      {"正","二","三","四","五","六","七","八","九","十","冬","腊"};
	   private static String[] chineseDayNames =
		   {"初一","初二","初三","初四","初五","初六","初七","初八","初九","初十",
		   "十一","十二","十三","十四","十五","十六","十七","十八","十九","二十",
		   "廿一","廿二","廿三","廿四","廿五","廿六","廿七","廿八","廿九","三十"};
	   private static String[] principleTermNames =
	      {"大寒","雨水","春分","谷雨","夏满","夏至","大暑","处暑","秋分","霜降", 
	       "小雪","冬至"};
	   private static String[] sectionalTermNames =
	      {"小寒","立春","惊蛰","清明","立夏","芒种","小暑","立秋","白露","寒露",
	       "立冬","大雪"};
	   
	   public String getSolarTerms(){
		  if (gregorianDate==sectionalTerm) {
	         return sectionalTermNames[gregorianMonth-1];
	      } else if (gregorianDate==principleTerm) {
	         return principleTermNames[gregorianMonth-1];
	      }
	      return "";
	   }
   public String getChineseMonthName(){
	   if (chineseMonth>0) {
	      	 return chineseMonthNames[chineseMonth-1]+"月";
	   } else
	      	 return "闰"+chineseMonthNames[-chineseMonth-1]+"月"; 
   }
   
   public String getChineseDayName(){
	   return chineseDayNames[chineseDate -1];	   
   }
   
   public String getChineseDayNameWithMonth(){
	   return getChineseMonthName() + getChineseDayName();   
   }
   
   public String getShortChineseDayNameWithMonth(){
	   if(chineseDate==1)
		   return getChineseMonthName();
	   else
		   return getChineseDayName();
   }
   	   
	public int getChineseYear() {
		return chineseYear;
	}
	
	public int getChineseMonth() {
		return chineseMonth;
	}

	public int getChineseDate() {
		return chineseDate;
	}
	
	public Calendar getGregorianCalendar(){
		Calendar c = Calendar.getInstance();
		c.set(Calendar.YEAR, gregorianYear);
		c.set(Calendar.MONTH, gregorianMonth-1);
		c.set(Calendar.DATE, gregorianDate);
		return c;
	}

	public String getDateString() {
	      String str = "*  /  ";
	      String gm = String.valueOf(gregorianMonth);
	      if (gm.length()==1) gm = ' ' + gm;
	      String cm = String.valueOf(Math.abs(chineseMonth));
	      if (cm.length()==1) cm = ' ' + cm;
	      String gd = String.valueOf(gregorianDate);
	      if (gd.length()==1) gd = ' ' + gd;
	      String cd = String.valueOf(chineseDate);
	      if (cd.length()==1) cd = ' ' + cd;
	      if (gregorianDate==sectionalTerm) {
	         str = " "+sectionalTermNames[gregorianMonth-1];
	      } else if (gregorianDate==principleTerm) {
	         str = " "+principleTermNames[gregorianMonth-1];
	      } else if (chineseDate==1 && chineseMonth>0) {
	      	 str = " "+chineseMonthNames[chineseMonth-1]+"月";
	      } else if (chineseDate==1 && chineseMonth<0) {
	      	 str = "*"+chineseMonthNames[-chineseMonth-1]+"月";
	      } else {
	      	 str = gd+'/'+cd;
	      }
	      return str;
	   }
	   public int rollUpOneDay() {
	      dayOfWeek = dayOfWeek%7 + 1;
	      dayOfYear++;
	      gregorianDate++;
	      int days = daysInGregorianMonth(gregorianYear,gregorianMonth); 
	      if (gregorianDate>days) {
	         gregorianDate = 1;
	         gregorianMonth++;
	         if (gregorianMonth>12) {
	            gregorianMonth = 1;
	            gregorianYear++;
	            dayOfYear = 1;
	            isGregorianLeap = isGregorianLeapYear(gregorianYear);
	         }
	         sectionalTerm = sectionalTerm(gregorianYear,gregorianMonth);
	         principleTerm = principleTerm(gregorianYear,gregorianMonth);
	      }
	      chineseDate++;
	      days = daysInChineseMonth(chineseYear,chineseMonth);
	      if (chineseDate>days) {
	         chineseDate = 1;
	         chineseMonth = nextChineseMonth(chineseYear,chineseMonth);
	         if (chineseMonth==1) chineseYear++;
	      }
	      return 0;
	   }
}
